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arXiv 1804.09059astro-ph.SR
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sdA问题- II。光度和光谱跟踪

The sdA problem - II. Photometric and Spectroscopic Follow-up

Ingrid Pelisoli, S. O. Kepler, D. Koester, B. G. Castanheira, A. D. Romero, L. Fraga

摘要:

次矮星A星(英语:Subdwarf A star,sdA)是一种光谱分类法,用来描述具有富氢光谱和次主序星表面重力,但有效温度低于零年水平分支的天体。它们的进化起源是个谜。在这项工作中,我们讨论了选定的sdAs的后续观测结果。我们获得了24个对象的时间分辨光谱,和时间序列测光另外19个对象。对于两个目标,我们报告的光谱和光度观测。我们确认了七个新的极低质量白矮星(ELMs),其中一个是已知的食星。我们还发现了第八个成员的脉动榆树类。

英文摘要:

Subdwarf A star (sdA) is a spectral classification given to objects showing H-rich spectra and sub-main sequence surface gravities, but effective temperature lower than the zero-age horizontal branch. Their evolutionary origin is an enigma. In this work, we discuss the results of follow-up observations of selected sdAs. We obtained time resolved spectroscopy for 24 objects, and time-series photometry for another 19 objects. For two targets, we report both spectroscopy and photometry observations. We confirm seven objects to be new extremely-low mass white dwarfs (ELMs), one of which is a known eclipsing star. We also find the eighth member of the pulsating ELM class.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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